Blast device

Abstract

To prevent damage or malfunction on components assembled inside a rotor cover caused by a scattered abrasive material.SOLUTION: A blast device includes: a rotor 1; and a rotor cover 4 having a peripheral wall, a bottom opening, and a top opening. A rotor bearing unit 20 is connected to the rotor, and an abrasive material is projected toward a workpiece utilizing the centrifugal force of blades 3 provided on the rotor by rotating the rotor at high speed. On the inner periphery of the peripheral wall, a first surface is provided on the rotor bearing unit side and a second surface is provided at a position opposite to the first surface. On the first surface and / or the second surface, a first shielding wall and / or a second shielding wall that can block the abrasive material scattered from the blades in directions other than the bottom opening are respectively provided on the first surface and / or the second surface in a protruding manner.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a grinding material projection device used for abrasive blasting.

Background Art

[0002] Conventionally, abrasive blasting has been performed to peel off and remove rust, scale, paint, etc. on the surface of a workpiece by projecting a grinding material composed of fine rigid balls or the like toward the workpiece.

[0003] And as a projection device for a grinding material used for such abrasive blasting, a blasting device as shown in Patent Document 1 is generally used. This blasting device is configured such that by rotating a rotor formed by standing a plurality of blades on the surface of a disk at high speed, the grinding material can be continuously projected onto the workpiece by the rotation of the blades.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The blasting device disclosed in Patent Document 1 will be described with reference to FIGS. 7 and 8. That is, as shown in FIG. 7, in the blasting device described in Patent Document 1, a rotor (103) formed by vertically installing blades (102) on a disk (101) is connected to a rotor shaft (not shown), and the rotor (103) is configured to rotate at high speed. Further, the rotor (103) is connected to a rotor bearing unit (106) via the rotor shaft while being housed in a box-shaped rotor cover (104) having an open bottom. Further, a chute (105) for supplying abrasive to the rotor (103) is provided protruding from the rotor cover (104) on the side opposite to the assembly side of the rotor bearing unit (106).

[0006] By the way, when blasting is performed using a blasting device as described in Patent Document 1, the abrasive that hits the object to be ground and bounces back may return to the inside of the rotor cover (104) from the bottom opening of the rotor cover (104). However, in general, most of the returned abrasive either hits the blade (102) again and bounces back, or re-entry into the rotor cover (104) is prevented by a large amount of abrasive projected from the bottom opening.

[0007] However, in the blasting device described in Patent Document 1, as shown in FIG. 8, a wide gap corresponding to the assembly height of the rotor shaft (113) is formed between the rotor (111) and the inner surface of the rotor cover (112). Therefore, the abrasive that hits the object to be ground and bounces back as described above may enter the rotor cover (112) again and enter this gap. Similarly, when blasting devices are arranged on both sides of the object to be ground and abrasive is projected onto the object to be ground from the two opposing blasting devices, the abrasive projected from one of the opposing devices may enter the above gap in the rotor cover (112) of the other device.

[0008] Here, in a general blasting device, as shown in FIG. 7, a protective rubber (107) is provided on the connection side of the rotor cover (104) of the rotor bearing unit (106) to prevent dust from entering the drive mechanism assembled to the rotor bearing unit (106). However, when abrasive enters the gap as described above, the abrasive collides with the protective rubber (107) and erodes and destroys the protective rubber (107). As a result, the abrasive may enter the periphery of the rotor shaft housed inside the drive mechanism or the packing (108). In such a case, the operation of the rotor shaft may stop, and the device may malfunction.

[0009] Also, in a conventional blasting device, generally, as shown in FIG. 9, with a packing (119) disposed on the outer periphery of the upper opening (117) of the rotor cover (116), a lid body (118) is covered and disposed on the upper opening (117). However, when projecting abrasive toward the workpiece in the same manner as above, the abrasive may scatter unintentionally in the direction of the upper opening (117) of the rotor cover (116). In such a case, the abrasive scattered toward the upper opening (117) side collides with the packing (119), causing the packing (119) to wear and break, so there is a risk that the abrasive will leak out from the lid body (118).

Means for Solving the Problem

[0010] In order to solve the problems as described above, in the present application, even when the abrasive projected from the inside of the rotor cover toward the bottom opening hits the workpiece and then enters the inside of the rotor cover again and scatters, it is possible to prevent the parts assembled inside the rotor cover from malfunctioning or being damaged by the abrasive scattered in a direction other than the bottom opening inside the rotor cover. The present invention aims to obtain a blasting device.

[0011] That is, the invention of the present application is a blasting device having: (1) a rotor provided with blades on a disk, and a rotor cover having a peripheral wall and provided with a bottom opening and an upper opening at the bottom of the peripheral wall and at a position opposite to the bottom, respectively. A rotor bearing unit for transmitting rotational power to the rotor is connected to the rotor housed in the rotor cover. By rotating the rotor at high speed, abrasive is projected toward a workpiece using the centrifugal force of the blades. On the inner periphery of the peripheral wall, there are a first surface provided on the rotor bearing unit side and a second surface provided at a position opposite to the first surface. The blasting device is characterized in that on the first surface and / or the second surface, a first shielding wall and / or a second shielding wall capable of shielding abrasive scattered from the blades in a direction other than the bottom opening direction are respectively protruded on the first surface and / or the second surface. (2) The blasting device according to (1), wherein the first shielding wall and / or the second shielding wall are provided on the upper opening side of the first surface and / or the second surface. (3) The blasting device according to (1) or (2), wherein the first shielding wall is provided on the bottom opening side of the first surface. (4) The blasting device according to (1), wherein the first shielding wall and / or the second shielding wall are formed in an arc shape on the outer peripheral side of the rotor. (5) The gist of the blasting device according to claim 1 is that the first shielding wall and / or the second shielding wall have an arrangement interval between the tip of the first shielding wall and / or the second shielding wall and the blade of 3 m or more and 10 mm or less.

Effect of the Invention

[0012] As described above, in the present invention, a first shielding wall and / or a second shielding wall capable of shielding abrasive grains scattered in a direction other than the bottom opening of the rotor cover are provided protruding from the inner circumference of the rotor cover. Therefore, even when abrasive grains projected from the rotor cover in the direction of the bottom opening enter the inside of the rotor cover and scatter without hitting the work piece and being discharged outside the rotor cover as they are, due to the presence of the first shielding wall and the second shielding wall, it is possible to prevent the abrasive grains from entering the gap between the rotor cover and the rotor or damaging the protective rubber or packing assembled in the rotor cover. Therefore, it is possible to effectively prevent malfunctions of the rotor assembled in the rotor cover and leakage of abrasive grains from the rotor cover due to damage of the packing.

Brief Description of Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0014] [First Embodiment] The first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Regarding the first embodiment of the present invention, as shown in FIG. 1, (1) is a rotor, which is formed by vertically arranging a plurality of blades (3) at equal intervals on the surface of a disk (2). And this rotor (1) is housed and arranged in a rotor cover (4) described below. That is, the rotor cover (4) is provided with an upper opening (5) and a bottom opening (6) at the upper end and the lower end respectively, and is formed by a cover body (7), a first protective plate (8) assembled to the inner circumference of the cover body (7), a second protective plate (10), and a pair of side protective plates (11).

[0015] And the cover body (7) is formed in a flat substantially trapezoidal cylindrical shape with the lower end side wider than the upper end side. Also, on the inner circumference of the cover body (7), on the assembly side of a rotor bearing unit (20) described below, a substantially trapezoidal first protective plate (8) composed of a pair of flat plates is assembled, and at a position opposite to the first protective plate (8), a second protective plate (10) having the same shape as the first protective plate (8) is assembled respectively.

[0016] Also, in the space between the first protective plate (8) and the second protective plate (10), as shown in FIG. 1, a pair of substantially rectangular side protective plates (11) are assembled respectively. Also, a protruding flange (12) is provided on the outer circumference of the bottom of the cover body (7), and a cover packing (13) having the same dimensions as the protruding flange (12) is covered and arranged on the bottom surface of the protruding flange (12). And the cover body (7), the first protective plate (8), the second protective plate (10), and the pair of side protective plates (11) constitute the peripheral wall (14) of this embodiment.

[0017] Still, the rotor covers (4), (41) of the present embodiment and the second embodiment described below are configured by assembling the cover main bodies (7), (54), one protective plate (8), (48), the other protective plate (10), (50), and a pair of side protective plates (11), (51) as described above. However, in other different embodiments, it is not limited to this, and it may not be formed by assembling a plurality of members as in the present embodiment but may be formed of a single plate. Further, at the central portions of the one wall (15) on the side where the one protective plate (8) is disposed and the other wall (16) on the side where the other protective plate (10) is disposed, which constitute the peripheral wall (14), an annular one central opening (17) and the other central opening (18) are provided at corresponding positions, respectively.

[0018] And as shown in FIG. 2, a rotor bearing unit (20) is connected and disposed on the one wall (15), and the tip side of the rotor bearing unit (20) is assembled so as to project inward of the rotor cover (4) from the one central opening (17). A rotor shaft (21) is provided at the tip of the rotor bearing unit (20), and the rotor (1) is connected to the rotor shaft (21) via an impeller (22) and an impeller bolt (23). Thereby, the rotor (1) is assembled in a rotatable state within the rotor cover (4). Further, a drive mechanism (not shown) is connected to the rotor bearing unit (20), and by operating the drive mechanism, the rotor (1) can be rotated about the rotor shaft (21).

[0019] Also, a chute (24) for supplying abrasive to the rotor (1) is connected to the other wall (16) of the rotor cover (4). The proximal end side of the chute (24) is disposed at a position facing the rotor (1) through the other central opening (18) of the rotor cover (4). The distal end side of the chute (24) is assembled so as to project outward of the other wall (16) and be located above the proximal end side.

[0020] On the first surface (25) which is the inner surface of one wall (15) of the rotor cover (4) and the second surface (26) which is the inner surface of the other wall (16), on the upper opening (5) side, there are respectively provided a first shielding wall (27) in an arc shape along the one central opening (17) and a second shielding wall (28) in an arc shape along the other central opening (18). In the present embodiment, the first shielding wall (27) and the second shielding wall (28) are formed in an arc shape, but in other different embodiments, it is not limited to this, and they can also be formed in a linear shape or other shapes. That is, the first shielding wall (27) and the second shielding wall (28) may have any shape as long as they can shield at least a part of the abrasive material scattered in a direction other than the bottom opening (6), particularly near the outer edge of the upper opening (5).

[0021] In addition, the first shielding wall (27) and the second shielding wall (28) are formed such that the shortest arrangement interval (32) between the respective tips (30)(31) and the blade (3) is between 3 mm and 10 mm. Therefore, when the device of the present embodiment is operating, a situation where the first shielding wall (27) and the second shielding wall (28) collide with the blade (3) can be prevented, and the device can be operated in a good state.

[0022] On the inner surfaces of the pair of side protection plates (11), there are respectively provided inclined protrusions (33) with a substantially triangular cross-section that are inclined in an arc shape toward the upper opening (5) side. When the pair of side protection plates (11), the one protection plate (8), and the other protection plate (10) are assembled, as shown in FIG. 3, on the inner periphery of the upper opening (5) of the rotor cover (4), the first shielding wall (27) or the second shielding wall (28) is configured to be continuously arranged between the pair of inclined protrusions (33).

[0023] In addition, as shown in FIG. 2, a lid body (34) is covered and arranged on the inner periphery of the upper opening (5) of the rotor cover (4), a packing (35) is arranged on the outer periphery of the lid body (34), and a lid cover (36) is fixedly arranged on the upper opening (5) of the rotor cover (4) in a state where the packing (35) and the lid body (34) are covered.

[0024] In the blasting device configured as described above, the abrasive supplied from the chute (24) is projected toward the workpiece to be machined through the bottom opening (6) of the rotor cover (4) by the centrifugal force of the blade (3) that rotates at high speed together with the rotor (1) by the driving mechanism, and blasting is performed.

[0025] When the abrasive is projected onto the workpiece to be machined as described above, it may scatter unintentionally in the direction of the upper opening (5) instead of the bottom opening (6) of the rotor cover (4). In such a case, in the above-described conventional blasting device, the abrasive scattered to the upper opening (5) side collides with the packing (35) assembled to the upper opening (5), and the packing (35) is damaged, so that the sealing performance on the upper opening (5) side of the rotor cover (4) deteriorates, and there has been a problem that the abrasive leaks out to the outside of the rotor cover (4).

[0026] However, in the present embodiment, as described above, due to the presence of the first shielding wall (27) and the second shielding wall (28) provided on the first surface (25) and the second surface (26) of the rotor cover (4) respectively, the abrasive scattered to the upper opening (5) side hits the first shielding wall (27) and the second shielding wall (28), so that it is possible to prevent the collision with the packing (35). Therefore, it is possible to prevent a situation where the abrasive leaks out to the outside of the rotor cover (4) due to the damage of the packing (35) caused by the abrasive scattered to the upper opening (5) side as in the conventional blasting device, and it is possible to keep the quality of the blasting device good.

[0027] Furthermore, since the inclined protrusions (33) are respectively provided on the inner surfaces of the pair of side protection plates (11) constituting the rotor cover (4), due to the presence of the pair of inclined protrusions (33), it is also possible to prevent the collision of the abrasive scattered to the upper opening (5) side with the packing (35) in the same manner as the first shielding wall (27) and the second shielding wall (28), and it is possible to make the prevention of the leakage of the abrasive from the lid body (34) and the lid cover (36) due to the damage of the packing (35) more effective.

[0028] [Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIGS. 4 to 6. In the first embodiment described above, the first shielding wall (27) and the second shielding wall (28) are respectively projected on the upper opening (5) side of the rotor cover (4). However, in this embodiment, the first shielding wall (43) is projected on the bottom opening (42) side of the rotor cover (41). The following is an explanation of this second embodiment. (44) is a rotor, which is formed by vertically arranging a plurality of blades (46) at equal intervals on the surface of the disk (45). And this rotor (44) is housed and arranged in a rotor cover (41) described below. The rotor cover (41) is provided with an upper opening (47) and a bottom opening (42) at the upper end and the lower end respectively, and is formed by a cover body (54), one protective plate (48), the other protective plate (50), and a pair of side protective plates (51) assembled to the inner circumference of the cover body (54).

[0029] And the cover body (54) is formed in a flat substantially trapezoidal cylindrical shape with the lower end side wider than the upper end side. Further, on the inner circumference of the cover body (54), one protective plate (48) is assembled to the assembling side of the rotor bearing unit (63), and on the opposing position of the one protective plate (48), the other protective plate (50) having the same shape as the one protective plate (48) is assembled respectively.

[0030] Also, between the one protective plate (48) and the other protective plate (50), a pair of substantially rectangular side protective plates (51) are respectively assembled as shown in FIG. 4. Further, a protruding flange (52) is provided on the outer periphery of the bottom of the cover body (54), and a cover packing (53) having the same dimensions as the protruding flange (52) is covered and disposed on the bottom surface of the protruding flange (52). Then, the cover body (54), the one protective plate (48), the other protective plate (50), and the pair of side protective plates (51) constitute the peripheral wall (55) of the present embodiment. Further, in the rotor cover (41) having the above configuration, annular one central opening (61) and the other central opening (62) are provided at corresponding positions in the central portions of the one wall (56) on the side where the one protective plate (48) is disposed and the other wall (57) on the side where the other protective plate (50) is disposed, respectively.

[0031] In the rotor cover (41) configured as described above, as shown in FIG. 5, a rotor bearing unit (63) is connected and disposed on the one wall (56), and the tip side of the rotor bearing unit (63) is assembled so as to protrude inward from the one central opening (61) of the one wall (56). A rotor shaft (64) is provided at the tip of the rotor bearing unit (63), and the rotor (44) is connected to the rotor shaft (64) via an impeller (65) and an impeller bolt (66). Thereby, the rotor (44) is assembled in a state where it can rotate within the rotor cover (41). Further, the rotor bearing unit (63) is connected to a drive mechanism (not shown), and by operating the drive mechanism, the rotor (44) can be rotated about the rotor shaft (64).

[0032] Also, a chute (67) for supplying abrasive to the rotor (44) is connected to the other wall (57) of the rotor cover (41). The proximal end side of the chute (67) is disposed at a position facing the rotor (44) through the other central opening (62) of the rotor cover (41). The distal end side of the chute (67) is assembled so as to protrude outward from the other wall (57) and be positioned above the proximal end side.

[0033] Also, on the first surface (68), which is the inner surface of one wall (56) constituting the peripheral wall (55), an arc-shaped first shielding wall (43) along the one central opening (61) is protruding on the bottom opening (42) side (the lower side in the drawing of FIG. 6) as shown in FIG. 6. In the present embodiment, the first shielding wall (43) is formed in an arc shape, but in other different embodiments, it is not limited to this, and it can also be formed in a linear shape or other shapes. That is, the first shielding wall (43) may have a shape that can shield at least a part of the abrasive scattered in the direction of the gap (73) corresponding to the assembly height of the rotor shaft (64) on the side of one protective plate (48) in a direction other than the bottom opening (42). Details of the gap (73) will be described later.

[0034] Also, the first shielding wall (43) is formed such that the shortest arrangement interval (60) between its tip (58) and the blade (46) is between 3 mm or more and 10 mm or more. Therefore, when the device of the present embodiment is in operation, a situation where the first shielding wall (43) and the blade (46) collide can be prevented, and the device can be operated in a good state.

[0035] An opening flange (69) protrudes from the upper opening (47) of the rotor cover (41), and a lid body (70) is covered and arranged on the upper opening (47) as shown in FIG. 5. Also, a packing (71) is arranged on the upper surface of the opening flange (69), and a lid cover (72) is fixedly arranged on the upper opening (47) of the rotor cover (41) in a state of covering the packing (71) and the lid body (70).

[0036] In the blasting device configured as described above, the abrasive supplied from the chute (67) is projected toward the workpiece to be ground through the bottom opening (42) of the rotor cover (41) by the centrifugal force of the blade (46) that rotates at high speed together with the rotor (44) by the drive mechanism, and blasting is performed.

[0037] When the blasting process is performed as described above, even if the abrasive that hits the object to be ground and bounces back returns inside through the opening of the rotor cover (41), most of it will hit the blade (46) again and bounce back, or the re-entry into the rotor cover (41) will be blocked by a large amount of abrasive projected from the opening.

[0038] However, as shown in FIG. 5, since a wide gap (73) corresponding to the assembly height of the rotor shaft (64) is formed between the first surface (68) of the rotor cover (41) and the rotor (44), the abrasive that hits the object to be ground and bounces back as described above may enter this gap (73). Similarly, when blast devices are arranged on both sides of the object to be ground to perform blasting on the object to be ground, the abrasive projected from one of the opposing devices may enter the gap (73) of the other device.

[0039] In such a case, as shown in FIG. 5, a general blast device is provided with a protective rubber (74) for the purpose of preventing dust from entering the drive mechanism connected to the rotor bearing unit (63). However, when the abrasive collides with the protective rubber (74) and destroys the protective rubber (74), as a result, the abrasive may enter the drive mechanism side of the rotor bearing unit (63). And when the abrasive enters around the rotor shaft (64) or the drive mechanism side, the operation of the rotor shaft (64) may stop and the rotor (44) may not operate, which may cause a malfunction in the device.

[0040] However, in this embodiment, as described above, since the first shielding wall (43) is provided on the first surface (68) of the rotor cover (41), even when the abrasive scatters toward the gap (73), the first shielding wall (43) can prevent it from entering the gap (73) and prevent it from colliding with the protective rubber (74). Therefore, it is possible to prevent the situation where the protective rubber (74) is damaged and the abrasive enters around the rotor shaft (64), so that it is possible to effectively prevent malfunctions in the device during the blasting process.

[0041] Still, in the present embodiment, as described above, an arc-shaped first shielding wall (43) is provided along the one central opening (61) on the bottom opening (42) side of the first surface (68) of the rotor cover (41). However, in other different embodiments, it is not limited to this. The first shielding wall (43) may project annularly along the one central opening (61), or in addition to the first shielding wall (43), a shielding wall similar to the first shielding wall (27) of the first embodiment may project on the upper opening (47) side of the rotor cover (41). In such a case, shielding walls will exist not only on the bottom opening (42) side but also on the upper opening (47) side of the rotor cover (41). Also, although not shown, by changing the configuration inside the rotor cover 41, not only the above-described gap (73), but also when a gap is generated between the second surface (75) facing the first surface (68) of the rotor cover (41) and the tip (77) of the blade (46), in order to prevent the abrasive from entering the gap, an arc-shaped shielding wall may also be provided along the one central opening (61) on the bottom opening (42) side of the second surface (75).

[0042] Therefore, it is possible to prevent the malfunction of the rotor (44) during the blasting process as in the present embodiment, and it is also possible to prevent the leakage of the abrasive from the cover cover (72) due to the damage of the packing (71) as in the first embodiment. Therefore, the malfunctions of the device can be prevented more effectively, and the state of the device can be maintained in a better condition.

Explanation of Reference Numerals

[0043] 1,44···Rotor 2,45···Disk 3,46···Blade 4,41···Rotor Cover 5,47···Upper Opening 6,42···Bottom Opening 14,55···Peripheral Wall 20,63···Rotor Bearing Unit 25,68···First Surface 26,75···Second Surface 27,43···First Shielding Wall 28 ··· Second shielding wall 30, 31, 58 ··· Tip 32, 60 ··· Arrangement interval

Claims

1. A blast device having a rotor provided with blades on a disk, and a rotor cover having a peripheral wall and having a bottom opening and an upper opening at the bottom of the peripheral wall and at a position opposite to the bottom, respectively. A rotor bearing unit for transmitting rotational power to the rotor is connected to the rotor housed in the rotor cover, and the centrifugal force of the blades is utilized by rotating the rotor at high speed to project abrasive against a workpiece. In the blast device, the inner periphery of the peripheral wall has a first surface provided on the rotor bearing unit side and a second surface provided at a position opposite to the first surface, a first shielding wall and / or a second shielding wall capable of shielding abrasive scattered from the blades in a direction other than the bottom opening are respectively provided protruding from the first surface and / or the second surface on the first surface and / or the second surface. The blast device is characterized by this.

2. The blast device according to claim 1, wherein the first shielding wall and / or the second shielding wall are provided on the upper opening side of the first surface and / or the second surface.

3. The blast device according to claim 1 or 2, wherein the first shielding wall is provided on the bottom opening side of the first surface.

4. The blast device according to claim 1, wherein the first shielding wall and / or the second shielding wall are formed in an arc shape on the outer peripheral side of the rotor.

5. The blast device according to claim 1, wherein the first shielding wall and / or the second shielding wall have an arrangement interval between the tip of the first shielding wall and / or the second shielding wall and the blade of 3 mm or more and 10 mm or less.

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